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Daily Newshydrationhealth myths

The 8 glasses of water rule was born in 1945 — and everyone forgot the fine print

T

Elites HideitAuthor

6 min read · 29 September 2026

The viral reel tying the 8-glasses-of-water rule to 1945 water fluoridation gets the dates right and the conspiracy wrong: the famous advice really was born that year — from a forgotten caveat, not a cover-up.

The 8-glasses story in 30 seconds

1945: US Food and Nutrition Board suggests 2.5 litres of daily water intake
The fine print said most of it could come from food — that part got lost
That same year, fluoridation trials began in four pairs of cities
Reviews find no evidence healthy adults need 8 glasses a day
Thirst, coffee, soup and watery foods all count toward hydration

Sources (3)

www.mcgill.ca/oss/article/health-nutrition/water-myth
www.cdc.gov/mmwr/preview/mmwrhtml/mm4841a1.htm
www.health.harvard.edu/digestive-health/the-8-glasses-per-day-rule

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